{"id":4991,"date":"2020-09-24T06:04:24","date_gmt":"2020-09-24T06:04:24","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4991"},"modified":"2020-09-24T06:04:24","modified_gmt":"2020-09-24T06:04:24","slug":"carbon-gray-streak","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/carbon-gray-streak\/","title":{"rendered":"Rayas grises carb\u00f3n"},"content":{"rendered":"

Las rayas grises de carbono son un tipo de fen\u00f3meno de segregaci\u00f3n superficial, debido a la diferencia en la deformaci\u00f3n y la plasticidad de las partes segregadas tras el laminado. Las rayas de la superficie presentan una disposici\u00f3n regular y, tras ser grabadas con \u00e1cido de alta concentraci\u00f3n, el patr\u00f3n adquiere un color negro, sin que se observen cambios evidentes en la estructura del grano. Este tipo de rayas suele aparecer en la producci\u00f3n de aleaciones, y la mayor\u00eda de ellas se encuentran en la superficie inferior y en los bordes de la banda.<\/p>\n

Motivo principal de la formaci\u00f3n de rayas grises de carb\u00f3n<\/strong><\/p>\n

(1) La cavidad l\u00edquida se hace m\u00e1s profunda cuando la zona de colada y laminaci\u00f3n es demasiado larga. La plancha no es f\u00e1cil de conformar nada m\u00e1s salir de la colada, y se ve sometida a la fuerza de laminaci\u00f3n, lo que genera una fuerza de cizallamiento. La temperatura de la capa de metal reci\u00e9n cristalizada en la zona de deformaci\u00f3n interna es relativamente alta, y no hay resistencia detr\u00e1s de la cavidad l\u00edquida. Cuando la fuerza de cizallamiento supera la del metal solidificado r\u00edgidamente, y dado que la resistencia al cizallamiento es elevada, la zona intergranular de baja resistencia tiende a separarse, deformarse y producir deslizamiento posterior. La aleaci\u00f3n con alto contenido de componentes fluye primero y se llena, formando cada una una gran cantidad de estructura eut\u00e9ctica, lo que provoca segregaci\u00f3n.<\/p>\n

(2) Debido a las caracter\u00edsticas de la aleaci\u00f3n, el intervalo de cristalizaci\u00f3n es amplio y la densidad es elevada, por lo que es probable que se produzca una segregaci\u00f3n por densidad en la superficie inferior de la pieza en bruto.<\/p>\n

(3) La diferencia entre el boquilla de fundici\u00f3n<\/a> y, al ser el cilindro de gran tama\u00f1o, el radio de tensi\u00f3n superficial del aluminio fundido es elevado, lo que reduce la resistencia a los cambios de presi\u00f3n; en la zona de fase l\u00edquida, el aluminio fundido es propenso a la oxidaci\u00f3n al entrar en contacto con el aire. A medida que aumenta el espesor del \u00f3xido, esto afecta inevitablemente a la estabilidad del flujo del aluminio fundido.<\/p>\n

(4) En ocasiones aparecen unas pocas piezas en bruto de aluminio puro debido a los cambios en el di\u00e1metro reducido del rodillo, la temperatura del rodillo y la concentraci\u00f3n de la pulverizaci\u00f3n por llama.<\/p>\n

\"Rayas<\/p>\n

Medidas para el tratamiento de las manchas grises de carb\u00f3n<\/strong><\/p>\n

(1) Aseg\u00farese de que la boquilla de colada est\u00e9 alineada con la placa vertical y ajuste la posici\u00f3n relativa entre la boquilla de colada y el rodillo, la velocidad de la banda de colada y laminaci\u00f3n, la longitud de la zona de colada y laminaci\u00f3n y la temperatura del agua de refrigeraci\u00f3n, as\u00ed como otros par\u00e1metros del proceso.<\/p>\n

(2) Controlar la temperatura de la superficie del rodillo, la distancia entre la boquilla de colada y el rodillo, y la profundidad de la cavidad de l\u00edquido durante el proceso de producci\u00f3n, y mantener la distancia entre la boquilla de colada y el rodillo dentro del rango de 0,2-0,3 mm, teniendo en cuenta el rebote del rodillo, su deformaci\u00f3n y la deformaci\u00f3n t\u00e9rmica de la boquilla de colada, y ajustar el tama\u00f1o del chorro de llama de forma adecuada.<\/p>\n

(3) Si es necesario, utilice el m\u00e9todo de rotura de la banda para romper la pel\u00edcula de \u00f3xido situada en la parte delantera de la boquilla de colada y eliminar las rayas grises de carbono. El procesamiento con cinta rota conlleva ciertos riesgos. Es necesario que el nivel de l\u00edquido del canal de colada y de la caja delantera sea lo m\u00e1s bajo posible y se mantenga constante, y que la velocidad m\u00ednima del laminador se controle adecuadamente para obtener resultados evidentes.<\/p>","protected":false},"excerpt":{"rendered":"

Carbon gray streak is a kind of surface segregation phenomenon, the difference in deformation and plasticity of segregated parts after rolling. The stripes on the…<\/p>","protected":false},"author":1,"featured_media":5023,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4991","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nCarbon Gray Streak Treatment in Aluminum Casting and Rolling<\/title>\n<meta name=\"description\" content=\"Carbon gray streak is a kind of surface segregation phenomenon, the difference in deformation and plasticity of segregated parts.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/es\/carbon-gray-streak\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Carbon Gray Streak Treatment 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